Exporting Morph Targets is still broken

[leo-petrucci]

After being very confused on how to actually export Morph Targets I found this thread

#8710

It doesn't seem like following what @filmshaw posted works at all. Not commenting out the the part of the code seems to add an Edgesplit to my mesh every time I try to export it. Which, in return, gives me the error that I can't export a mesh with modifiers and shape keys.

Which I suppose is what should be happening.

However, if I do comment out the code I just receive this error

I don't know if I'm just very confused as to how to go about this, but I can't seem to get it working. Is there a specific fix I'm missing for this specific issue or is this still open?

[leo-petrucci]

I tried fiddling with the object.py mentioned in the other thread.

It seems like uncommenting line 496 of object.py leads to a successful export that seems to have all the morph targets.
The file loads and displays correctly, however I have yet to try the morph targets.

[derivou]

Hello, I exported my model following the recommandation about the object.py file and got a loadable three.js file. BUT the animation is wrong ; it is a smoothed cube like shape and in Blender I deform just a few vertex ; in Three.js it results in a kind of rotation/elongation of the whole object. My material is a shader material using a copy of the phong vertex shader and the frag is phong. Any help ?

[leo-petrucci]

I ended up asking another question over here #12623 (comment) about the same exact problem.

As far as I understand it the exporter is either broken or not compatible with threejs. I was having your exact same problem and I couldn't find any solutions no matter how much I fiddled with the code or the exported itself.

Using a glTF exporter seems to fix the issue, however I have not been able to export to gltf while having a lot of morph targets. Blender just hangs forever on the exporting screen.

I used this https://github.com/KhronosGroup/glTF-Blender-Exporter to export it.
This https://github.com/Kupoman/blendergltf seems to also do the same, however last time I checked it did not export morph targets.

[derivou]

ok I updated to r88 and blender 2.79 ; as I have the same result, I tried this : in my three.js code I inverted Y=Z and Z=-Y for Mesh.Geometry.morphAttributes.position[0].array ; Then it works. So, there is somewhere inversion of Y and Z ...

[derivou]

Hi ,may I ask what is the current status of the io_three blender exporter ? is there any change in the different issues ?

[Mugen87]

It's better if focus on another formats and exporter. Read #12903 for more information.

[derivou]

Oh thanks I was not aware of this. So for objects combining skeleton animation and shape keys there is currently no workflow with no issues.

[looeee]

@derivou FBXLoader supports skeletal animation and morph targets.

However, I have no idea whether the blender exporter will successfully export them.

[donmccurdy]

GLTFLoader, KhronosGroup/glTF-Blender-Exporter, and FBX2glTF likewise support both skeletal animation and morph targets. As mentioned above there is a known issue in the Blender exporter where exporting many morph targets may take a long time. There are ways to fix that, if someone has the time to do a PR.

[derivou]

OK thanks for recommandations. I will follow the KhronosGroup ...

[Mugen87]

The JSON Blender exporter has been removed with R93 (#14117).

Also see: https://threejs.org/docs/#manual/introduction/Loading-3D-models